|Publication number||US6900527 B1|
|Application number||US 09/956,190|
|Publication date||May 31, 2005|
|Filing date||Sep 19, 2001|
|Priority date||Sep 19, 2001|
|Also published as||US6965159, US6998702, US7176062|
|Publication number||09956190, 956190, US 6900527 B1, US 6900527B1, US-B1-6900527, US6900527 B1, US6900527B1|
|Inventors||Jeffrey Alan Miks, Kenneth Kaskoun, Markus Liebhard, Donald Craig Foster, Paul Robert Hoffman, Frederic Bertholio|
|Original Assignee||Amkor Technology, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (35), Referenced by (5), Classifications (20), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates generally to circuit modules, and more specifically, to a method and assembly for interconnecting circuits within a circuit module.
Circuit modules or cards are increasing in use to provide storage and other electronic functions for devices such as digital cameras, personal computing devices and personal digital assistants (PDAs). New uses for circuit modules include multimedia cards and secure digital cards.
Typically, circuit modules contain multiple integrated circuit devices or “dies”. The dies are interconnected using a circuit board substrate, which adds to the weight, thickness and complexity of the module. Circuit modules also have electrical contacts for providing an external interface to the insertion point or socket, and these electrical contacts are typically circuit areas on the backside of the circuit board substrate, and the connection to the dies are provided through vias through the circuit board substrate. Producing vias in the substrate adds several process steps to the fabrication of the circuit board substrate, with consequent additional costs.
Therefore, it would be desirable to provide a method and assembly for interconnecting circuits within modules that require no circuit board substrate.
A circuit module assembly and method for interconnecting circuits within modules to provide a circuit module that may be fabricated without a circuit board substrate. A lead-frame assembly is connected to one or more dies and external contacts may be provided by an extension of the lead-frame assembly out of the plane of the die interconnect.
The present invention is best understood by reference to the following detailed description when read in conjunction with the accompanying drawings.
Common reference numerals are used throughout the drawings and detailed description to indicate like elements.
Referring now to the figures and in particular to
A carrier 14 to which integrated circuit dies 12 are attached and circuit contacts 13 are included on the bottom side, is covered by a cover 11 that is bonded to carrier 14. The circuit module housing may be completely formed from an encapsulant, or the circuit may be encapsulated and a lid 19 applied over the encapsulant. Dies 12 are coupled to each other and to circuit contacts 13 by circuit traces 16, which are typically etched from a metal layer on the top of carrier 14. Circuit contacts 13 are coupled by means of plated-through holes 15 that pass through carrier 14. The bottom side of carrier 14 is also typically etched from a metal layer on the bottom side forming electrical contacts 13 that are generally plated with a corrosion resistant material such as gold and circuit contacts 13 connect on the bottom side of carrier 14 to plated through holes 15 by circuit traces on the bottom side of carrier 14. Circuit traces 16 include wire bonding areas 17 that may also be plated, permitting a wire bonding apparatus to electically couple dies 12 by wires 18.
Referring now to
The present invention provides a circuit module that does not require a separate carrier, wherein the circuit paths between dies 12 and electrical contacts 13 are provided by a conductive lead-frame to which dies 12 are bonded and an encapsulant applied surrounding the lead-frame to provide support and electrical insulation.
Referring now to
In addition or in alternative to wire bonding pads 17A, pads may be included for attachment of surface mounted passive components by soldering or conductive adhesive attachment, and pad grids may be included for attachment of pre-packaged integrated circuits.
Referring now to
As an alternative, circuit contacts 13A may be fabricated is in the same plane as circuit traces 16A and additional length supplied so that the circuit traces may be bent to provide an extension out of the plane of circuit traces 16A so that circuit contacts 13A may protrude from an encapsulant applied beneath lead-frame 20.
The illustrative embodiments herein depict an etched lead-frame, but lead-frames may also be stamped in accordance with an embodiment of the present invention. The alternative embodiment depicted, wherein circuit traces are bent to provide circuit contacts especially lends itself to stamping, because the circuit traces may be formed and bent in a single stamping operation.
Referring now to
Referring now to
This disclosure provides exemplary embodiments of the present invention. The scope of the present invention is not limited by these exemplary embodiments. Numerous variations, whether explicitly provided for by the specification or implied by the specification, such as variations in structure, dimension, type of material and manufacturing process may be implemented by one of skill in the art in view of this disclosure.
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|JPH0717175A||Title not available|
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7391103 *||Aug 27, 2004||Jun 24, 2008||Infineon Technologies Ag||Electronic module having plug contacts and method for producing it|
|US8575738||Feb 29, 2012||Nov 5, 2013||Kabushiki Kaisha Toshiba||Semiconductor memory card|
|US9236329||Mar 5, 2013||Jan 12, 2016||Kabushiki Kaisha Toshiba||Semiconductor memory card|
|US9257763||Jul 2, 2013||Feb 9, 2016||Gyrus Acmi, Inc.||Hybrid interconnect|
|US20050087851 *||Aug 27, 2004||Apr 28, 2005||Edward Fuergut||Electronic module having plug contacts and method for producing it|
|U.S. Classification||257/679, 257/698, 257/E23.052, 257/E23.124|
|International Classification||H01L23/495, H01L23/31|
|Cooperative Classification||H01L2924/1815, H01L2924/14, H01L2224/48137, H01L2224/48091, H01L2924/181, H01L24/48, H01L23/3107, H01L23/49575, H01L2924/01078, H01L2924/01079, H01L2224/48247, H01L2924/3025|
|European Classification||H01L23/31H, H01L23/495L|
|Sep 19, 2001||AS||Assignment|
Owner name: AMKOR TECHNOLOGY, INC., ARIZONA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MIKS, JEFFREY ALAN;KASKOUN, KENNETH;LIEBHARD, MARKUS;ANDOTHERS;REEL/FRAME:012196/0755;SIGNING DATES FROM 20010823 TO 20010830
|Jan 3, 2006||AS||Assignment|
Owner name: BANK OF AMERICA, N.A., TEXAS
Free format text: SECURITY AGREEMENT;ASSIGNOR:AMKOR TECHNOLOGY, INC.;REEL/FRAME:017379/0630
Effective date: 20051123
|Dec 1, 2008||FPAY||Fee payment|
Year of fee payment: 4
|Nov 30, 2012||FPAY||Fee payment|
Year of fee payment: 8